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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 469

Although the causes of cancer ____we do not yet have any practical way to prevent it.

A.are being uncovered B.have been uncovering
C.are uncovering D.have uncovered
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Althoughthecausesofcancerwedon